Method and device for transmitting information

ABSTRACT

A method and device for transmitting information are provided, where the method includes that: according to a predetermined mode and/or eNB configuration mode, at least one of the following is determined: a Precoding Resource Block Group (PRG), a reference signal, and a frequency-domain resource allocation granularity; and information is transmitted in a Transmission Time Interval (TTI).

TECHNICAL FIELD

The present disclosure relates to the field of communications, and inparticular to a method and device for transmitting information.

BACKGROUND

The rapid development of mobile Internet and Internet of Things causesexplosive growth of data traffic and extensive rise of diversified anddifferentiated services. The 5G, as a new generation mobilecommunication technology, will support a higher rate (Gbps), highamounts of links (1M/Km2), an ultra-low delay (1 ms), higherreliability, and a hundredfold increase in energy efficiency compared tothe 4G, so as to support a new requirement change. The ultra-low delaydirectly, as a key index of the 5G technology, directly influences thedevelopment of delay-constrained services, such as Internet of Vehicles,industrial automation, remote control, and smart grids. At present, aseries of researches on standards of reducing a delay of the 5G arebeing advanced.

Reducing a Transmission Time Interval (TTI), as an important researchdirection of reducing a delay at present, is intended to reduce theexisting TTI whose length is 1 ms to 0.5 ms or oven the length of 1-2Orthogonal Frequency Division Multiplexing (OFDM) symbols, so that theminimum scheduling time is reduced exponentially, and a delay of singletransmission may also be reduced exponentially without changing a framestructure. The 3GPP has also set up a project to discuss a technology ofreducing a short TTI. In a short TTI technology, it is needed toreconsider both a Demodulation Reference Signal (DMRS) and a resourceallocation granularity.

There is no effective solution yet aiming at a problem of unreasonabledata transmission in the short TTI technology.

SUMMARY

The embodiments of the present disclosure provide a method and devicefor transmitting information, which may solve a problem of unreasonabledata transmission in the short TTI technology.

According to an embodiment of the present disclosure, a method fortransmitting information is provided, which includes that: according toa predetermined mode and/or eNB configuration mode, at least one of aPrecoding Resource Block Group (PRG), a reference signal, or afrequency-domain resource allocation granularity is determined; andinformation is transmitted in a TTI.

According to another embodiment of the present disclosure, a device fortransmitting information is provided, which includes: a determiningmodule and a transmitting module.

The determining module is configured to determine, according to thepredetermined mode and/or eNB configuration mode, at least one of thePRG, the reference signal, or the frequency-domain resource allocationgranularity.

The transmitting module is configured to transmit information in theTTI.

According to yet another embodiment of the present disclosure, a storagemedium is provided. The storage medium is configured to store a programcode for performing the following steps: according to the predeterminedmode and/or eNB configuration mode, at least one of the PRG, thereference signal, or the frequency-domain resource allocationgranularity is determined; and information is transmitted in the TTI.

Through the present disclosure, which includes that: at least one of thePRG, the reference signal, or the frequency-domain resource allocationgranularity is determined according to the predetermined mode and/orthrough an indication of the eNB, and information is transmitted in ashort TTI according to the above determined information, a problem inthe short TTI technology of unreasonable data transmission caused byunreasonable setting of related parameters is solved, thereby reasonablytransmitting data in case of using the short TTI technology.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings described here are used for providing furtherunderstanding of the present disclosure, and constitute a part of thepresent application. Schematic embodiments of the present disclosure anddescription thereof are used for illustrating the present disclosure andnot intended to form an improper limit to the present disclosure. In theaccompanying drawings:

FIG. 1 is a flowchart of the method for transmitting informationaccording to an embodiment of the present disclosure;

FIG. 2 is a first DMRS pattern when a TTI is composed of the eighthsymbol and the ninth symbol in a sub-frame according to an alternativeembodiment of the present disclosure;

FIG. 3 is a second DMRS pattern when the TTI is composed of the eighthsymbol and the ninth symbol in a sub-frame according to an alternativeembodiment of the present disclosure;

FIG. 4 is a third DMRS pattern when the TTI is composed of the eighthsymbol and the ninth symbol in a sub-frame according to an alternativeembodiment of the present disclosure;

FIG. 5 is a fourth DMRS pattern on a frequency domain of the TTIaccording to an alternative embodiment of the present disclosure;

FIG. 6 is a fifth DMRS pattern on a frequency domain of the TTIaccording to an alternative embodiment of the present disclosure;

FIG. 7 is a sixth DMRS pattern on a frequency domain of the TTIaccording to an alternative embodiment of the present disclosure;

FIG. 8 is a seventh DMRS pattern on a frequency domain of the TTIaccording to an alternative embodiment of the present disclosure;

FIG. 9 is a first DMRS pattern on a time domain of the TTI according toan alternative embodiment of the present disclosure;

FIG. 10 is a second DMRS pattern on a time domain of the TTI accordingto an alternative embodiment of the present disclosure;

FIG. 11 is a third DMRS pattern on a time domain of the TTI according toan alternative embodiment of the present disclosure; and

FIG. 12 is a structure diagram of the device for transmittinginformation according to an alternative embodiment of the presentdisclosure.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The present disclosure is elaborated below with reference to theaccompanying drawings and embodiments. It is to be noted that theembodiments and the features in the embodiments of the presentapplication may be combined with each other under the condition of noconflicts.

It is to be noted that the specification and claims of the presentdisclosure, and the terms like “first” and “second” in the accompanyingdrawings are used for differentiating the similar objects, but do nothave to describe a specific order or a sequence.

First Embodiment

The embodiments of the present application provide a mobilecommunication network (including, but not limited to, the 5G mobilecommunication network). A network architecture of the network mayinclude a network side device (for example, an eNB) and a terminal. Thepresent embodiment provides a method for transmitting information, whichmay be run on the network architecture. It is to be noted that therunning environment of the information transmission method provided bythe present embodiment of the present application is not limited to thenetwork architecture. FIG. 1 is a flowchart of the informationtransmission method according to the present embodiment of the presentdisclosure. As shown in FIG. 1, the flow includes the following steps.

At S102, according to a predetermined mode and/or eNB configurationmode, at least one of a PRG; a reference signal, or a frequency-domainresource allocation granularity is determined. In an exemplaryembodiment, modes of indicating the PRG according to the eNB include oneof the following: configuring through an SIB, configuring through RRCsignaling, and configuring through DCI.

At S104, information is transmitted in a TTI.

The method presented in the above embodiment is used for transmission ina short TTI. The short TTI in the present embodiment may be a TTI notgreater than 7 symbols. The presented method is applied, but notlimited, to a short TTI system. The present embodiment is elaborated bytaking downlink for example. The presented method may be applied toeither downlink or uplink.

An eNB and a piece of UE determine a value of the PRG, and then the eNBtransmits a Physical Downlink Shared Channel (PDSCH) to the UE accordingto the value of the PRG The PRG is composed of a number of PRBs. In aPRG, precoding matrixes used for transmission are the same.

In an exemplary embodiment, two modes of determining the PRG are givenbelow.

In the first mode, for a given length of the TTI, the value of the PRGmay be a fixed value, for example, 4. The value of the PRG has nothingto do with a system bandwidth. Preferably, the PRG is one of 2, 3, 4 and6, or an integral multiple of these values, namely one of factors,except 1, of 12. If the number of the PRBs corresponding to the systembandwidth is N, and N mod P>0, the size of a PRG is N−P└N/P┘, where theP is the size of the PRG, namely P PRBs, “mod” means a modulo operation,└⋅┘ means rounding down. The PRGs are divided from the lowest frequency.The size of the PRG does not increase, that is, the PRG with the highestfrequency has the minimum size.

In an exemplary embodiment, the PRGs may also be divided from thehighest frequency. For example, for the system bandwidth of 20 MHz, ifthe corresponding number of the PRBs is 100, and the size of the PRG is6, then the size of the last PRG is 4. This dividing mode may be appliedto all the embodiments of the present disclosure. In the presentembodiment, if the value of the PRG is n, it means that the PRG is nPRBs. In an exemplary embodiment, the length of all the short TTIscorresponds to the same size of the PRG

In an exemplary embodiment, the PRGs may also be divided infrequency-domain resources allocated to the UE. In the frequency-domainresources allocated to the UE, starting from an initial PRB, every mPRBs are one PRG For example, if the resources allocated to the UE arethe PRBs #2-9, and the value of the PRG is 4 PRBs, then the PRBs fromNo. 2 to No. 5 are one PRG, and PRBs from No. 6 to No. 9 are another PRGThe m is preset or configured by the eNB.

In an exemplary embodiment, the PRGs may also be divided in a span offrequency-domain resource allocated to the UE. In the span offrequency-domain resource allocated to the UE, starting from the initialPRB, every m PRBs are one PRG Here, the span of frequency-domainresource is the total number of the PRBs from the PRB with the lowestfrequency to the PRB with the highest frequency which are allocated tothe UE. When the resources allocated to the UE are continuous, thefrequency-domain resources and the span of frequency-domain resource arethe same. When the resources allocated to the UE are discrete, thefrequency-domain resources and the span of frequency-domain resource aredifferent. For example, when the frequency-domain resources allocated tothe UE are the PRBs No. 1, No. 4 and No. 8, the span of frequency-domainresource is 8; and in the span of frequency-domain resource, the PRBsfrom No. 1 to No. 4 are one PRG, and the PRBs from No. 5 to No. 8 areone PRG

In the second mode, the PRGs belong to a set of PRGs. The set includes nvalues of the PRG, herein the n is a positive integer greater than 1. Inthe n values of the PRG, each value of the PRG is a multiple of theminimum value of the PRG in the set. For example, the set of PRGsincludes three values of the PRG, which are respectively 3, 6 and 9,namely 3 PRBs, 6 PRBs and 9 PRBs. In an exemplary embodiment, the set isthe same for all the system bandwidths.

In an exemplary embodiment, the value of the PRG in the set of PRGs orthe minimum value of the PRG in the set of PRGs is one of the factors,except 1, of 12, or an integral multiple of one of the factors, except1, of 12.

In an exemplary embodiment, the set of PRGs is preset. For example, thetransmission of all the short TTIs corresponds to a set of PRGs, or eachlength of the TTI corresponds to a set of PRGs; the set corresponding toeach length of the TTI may be the same or different. In an exemplaryembodiment, the set of PRGs is notified by the eNB. For example, the setof PRGs is notified to the UE in the SIB, or notified to a user terminalor the UE in the RRC signaling. In an exemplary embodiment, the PRG usedfor transmission is preset, for example, the PRG is determined accordingto the system bandwidth. For example, if the set of PRGs is {4, 8}, thenthe PRG under 10 MHz is 4, and the PRG above 10 MHz is 8. Or, the PRG isdetermined according to the length of the TTI. For example, when thelength of the TTI is less than or equal to 4, the PRG is 8; and when thelength of the TTI is greater than 4, the PRG is 4. In an exemplaryembodiment, the PRG used for transmission is notified by the eNB, forexample, the PRG is notified by the eNB through the RRC signaling. Forexample, if the eNB notifies the UE that the PRG is 4, then the adoptedPRG is 4 in the subsequent transmission. Or, the PRG may also benotified through the DCI to indicate the PRG used for the transmissionof this time. In an exemplary embodiment, a bandwidth fed back by a CSIis an integral multiple of the number of the PRBs included in the PRG Inan exemplary embodiment, the bandwidth fed back by the CSI is preset,for example, it is equal to the PRG Or, the bandwidth fed back by theCSI is notified by the eNB, for example, the eNB notifies the UE of themultiple of the bandwidth fed back by the CSI relative to the PRG It isconcluded from the above two modes of determining the PRG that thenumbers of the PRBs corresponding to the PRG belong to a set, and eachelement in the set is equal to an integral multiple of the minimum valuein the set. The numbers of the PRBs corresponding to the PRG (alsocalled the minimum value in the set) are one of the following: any oneof 2, 3, 4 and 6; and a multiple of the number of the PRBs correspondingto a RBG in a system.

In an alternative embodiment of the present disclosure, the number ofthe PRBs corresponding to the frequency-domain resource allocationgranularity is one of the following: an integral multiple of the numberof the PRBs corresponding to the PRG, an integral multiple of a commonmultiple of the number of the PRBs corresponding to the PRG and thenumber of the PRBs corresponding to the RBG in the system, an integralmultiple of the minimum value in the set, and an integral multiple ofthe common multiple of the minimum value in the set and the number ofthe PRBs corresponding to the RBG in the system.

In the above embodiment, the eNB schedules the UE to performtransmission. The resources for the UE to perform transmission are anintegral multiple of the resource allocation granularity, herein theresource allocation granularity is the frequency-domain resourceallocation granularity. In an exemplary embodiment, the resourceallocation granularity is determined by the PRG, for example, anintegral multiple number of PRGs. Here, the PRG may be a preset value ora value which is configured to the UE by the eNB; or, for the set ofPRGs in the first embodiment, the PRG may be the minimum value of thePRG in the set of PRGs, that is, the resource allocation granularity isan integral multiple of the minimum value of the PRG in the set of PRGs.In an exemplary embodiment, the resource allocation granularity isdetermined by the PRG and the RBG The PRG here may be a preset value, ora value which is configured to the UE by the eNB, or the minimum valueof the PRG in the set of PRGs. In an exemplary embodiment, the resourceallocation granularity may be an integral multiple of the commonmultiple of the PRG and the RBG For example, for the system bandwidth of10 MHz, if the PRG is two PRBs, and the size of the RBG is three PRBs,the resource allocation granularity is six PRBs. Because the systembandwidth of 10 MHz is not an integral multiple of 6, the last resourceallocation granularity, namely the resource allocation granularity withthe highest frequency is 50 mod 6=2. In an exemplary embodiment, for agiven TTI, the resource allocation granularity is a fixed value for allthe system bandwidths. In an exemplary embodiment, the resourceallocation granularities corresponding to all the short TTIs are thesame. In an exemplary embodiment, the resource allocation granularityincreases with the increase of the system bandwidth. In an exemplaryembodiment, the bandwidth fed back by the CSI is an integral multiple ofthe number of the PRBs included in the resource allocation granularity.

In an alternative embodiment of the present disclosure, a design methodof the reference signal is provided. The present embodiment iselaborated by taking the DMRS for example, and the presented method isapplied, but not limited, to the DMRS.

In the present embodiment, the DMRS is designed in a group of continuousPRBs. The patterns in the continuous PRBs will be introduced below, forexample, the patterns are uniformly distributed in three PRBs. It isassumed that the number of the continuous PRBs is m. The value of the mmay be the number of PRBs corresponding to the PRG in the system, or theminimum value in the set of PRGs, or the number of the PRBscorresponding to the RBG in the system, or the preset value, or thevalue configured by the eNB, or the number N of the PRBs correspondingto the span of frequency-domain resource for transmitting theinformation. Here, the span of frequency-domain resource is the totalnumber of the PRBs from the PRB with the lowest frequency to the PRBwith the highest frequency which are allocated to the UE. For example,if the PRBs allocated to the UE are the PRBs from No. 1 to No. 6, the mis equal to 6; or, if the PRBs allocated to the UE are the PRBs No. 1,No. 4 and No. 8, the m is equal to 8. Or, the n may also be equal to└N/k┘, where the k is a positive integer which is preset or configuredby the eNB.

In an exemplary embodiment, the DMRS is designed in a group ofcontinuous PRBs. The number of the PRBs corresponding to the group ofcontinuous PRBs may be preset or notified by the eNB. Preferably, theDMRS is designed in the PRG or in the minimum PRG in the set of PRGs.For example, if the minimum PRG is two PRBs, the DMRS is designed in twoPRBs. Or, the DMRS may also be designed in the resources allocated tothe UE. For example, if the resources allocated to the UE by the eNB arethe PRBs from No. 3 to No. 10, then the DMRS is designed in the eightPRBs according to the pattern introduced below; or the DMRS is designed,according to the pattern introduced below, in the PRBs from No. 3 to No.6, or in the PRBs from No. 7 to No. 10. In the description below, theDMRS pattern is given by taking that the DMRS is designed in the PRG forexample. In practical applications, the DMRS is not limited to beingdesigned in the PRG

On an OFDM symbol where the reference signal is, in the PRG, for eachlayer of reference signal, one in every n REs is the reference signal,herein the n is an integral multiple of 3. In an exemplary embodiment,on the OFDM symbol where the reference signal is, and in the PRB, theDMRS occupies at least one of the following: the RE with the lowestfrequency in the PRG, or the RE with the lowest frequency, except the REwhere the CRS is, in the PRG; the RE with the highest frequency in thePRG, or the RE with the highest frequency, except the RE where the CRSis, in the PRG

On the symbol where the DMRS is, the DMRSs are distributed at regularintervals in the PRG That is, on a PRG, for each layer of DMRS, one inevery x REs is the RE corresponding to the DMRS, herein the x is amultiple of 3, such as 3, 6, and 9, as shown in the accompanyingdrawings from FIG. 2 to FIG. 4.

In the accompanying drawings from FIG. 2 to FIG. 10, each squarerepresents an RE, the black square represents the RE of the CRS, thesquare filled with diagonals and the square filled with latticesrepresent the transmitted reference signals.

FIG. 2 is a first DMRS pattern when a TTI is composed of the eighthsymbol and the ninth symbol in a sub-frame according to an alternativeembodiment of the present disclosure. FIG. 2 shows the DMRS pattern whena cell identity module 3 is 0. The pattern on the frequency domain mayalso be applied to other length and position of the TTI. For example,when the length of the TTI is three symbols, the DMRS may be on thefirst two symbols.

FIG. 3 is a first DMRS pattern when a TTI is composed of the eighthsymbol and the ninth symbol in a sub-frame according to an alternativeembodiment of the present disclosure. FIG. 3 shows the DMRS pattern whenthe cell identity module 3 is 1. The pattern on the frequency domain mayalso be applied to other length and position of the TTI.

FIG. 4 is a third DMRS pattern when the TTI is composed of the eighthsymbol and the ninth symbol in a sub-frame according to an alternativeembodiment of the present disclosure. FIG. 4 shows the DMRS pattern whenthe cell identity module 3 is 2. The pattern on the frequency domain mayalso be applied to other length and position of the TTI.

In the accompanying drawings from FIG. 2 to FIG. 4, the PRG is two PRBs,and the DMRSs are uniformly distributed in the PRG Each squarerepresents an RE. Corresponding to a related art in the field, the partof diagonals corresponds to two layers of DMRS, and a Code DivisionMultiplexing (CDM) technology is adopted between the two layers of DMRS;the part of squares corresponds to another two layers of DMRS, and theCDM technology is adopted between the two layers DMRS. There are fourlayers of DMRS transmitted, and the density of each layer of DMRS on thefrequency domain is that one in every six REs is applied to the DMRS.The pattern may also be applied to other length and position of the TTI.For example, when the length of the TTI is three symbols, the DMRS maybe on the first two symbols. In an exemplary embodiment, in one PRG, ifthe cell identity module 3 is 0, the RE with the lowest frequencycorresponding to the DMRS is the second RE according to an ascendingorder of frequencies in the PRG; if the cell identity module 3 is 1, theRE with the lowest frequency corresponding to the DMRS is the third REaccording to an ascending order of frequencies in the PRG; if the cellidentity module 3 is 0, the RE with the lowest frequency correspondingto the DMRS is the first RE according to an ascending order offrequencies in the PRG

In an exemplary embodiment, the intervals of different layers of DMRSmay be different. For example, one layer of DMRS is that one in everysix REs is the RE of the DMRS; another layer of DMRS is that one inevery nine REs is the RE of the DMRS.

In an exemplary embodiment, on the symbol where the DMRS is, the DMRSsare distributed at regular intervals in the PRG On one PRG, for eachlayer of DMRS, one in every x REs is the RE corresponding to the DMRS,here

${x = \left\lfloor \frac{{12m} - 2}{n - 1} \right\rfloor},$where the m and the n are positive integers, and the function └ ┘ meansrounding down. Here, “one in every x REs is the RE corresponding to theDMRS” may be understood as one in any x continuous REs on the frequencydomain is the RE corresponding to the DMRS. The m may be regarded as thenumber of the PRBs included in the PRG, and the n is the number of theREs corresponding to each layer of DMRS on the symbol in one PRG

In an exemplary embodiment, on the symbol where the DMRS is, the DMRSsare distributed at regular intervals in the PRG On one PRG, for eachlayer of DMRS, one in every x REs is the RE corresponding to the DMRS,here

${x = \left\lfloor \frac{{12m} - 1}{n - 1} \right\rfloor},$where the m and the n are positive integers. The m may be regarded asthe number of the PRBs included in the PRG, and the n is the number ofthe REs corresponding to each layer of DMRS on the symbol in one PRG

FIG. 5 is a fourth DMRS pattern on a frequency domain of the TTIaccording to an alternative embodiment of the present disclosure. Beingsimilar to the accompanying drawings from FIG. 2 to FIG. 4, the part ofdiagonals and the part of squares represent the DMRS. For example, asshown in FIG. 5, if the number of the PRBs included in the PRG is 2,that is, the m is equal to 2, and the number of the REs corresponding toeach layer of DMRS on the symbol in one PRG is 4, that is, the n isequal to 4, then the x is equal to 7. It can be seen that for each layerof DMRS, only one in any continuous 7 REs on the frequency domain is theRE transmitting the DMRS.

FIG. 6 is a fifth DMRS pattern on a frequency domain of the TTIaccording to an alternative embodiment of the present disclosure. Beingsimilar to the accompanying drawings from FIG. 2 to FIG. 4, the part ofdiagonals and the part of squares represent the DMRS. As shown in FIG.6, if the number of the PRBs included in the PRG is 2, that is, the m isequal to 2, and the number of the REs corresponding to each layer ofDMRS on the symbol in one PRG is 3, that is, the n is equal to 4, thenthe x is equal to 11. It can be seen that the DMRSs of each layer areuniformly distributed on the PRG, and get close enough to the edge ofthe PRG

Or, on the symbol where the DMRS is, the DMRS with the lowest frequencyand the DMRS with the highest frequency are respectively at two ends ofthe PRG, namely the RE with the lowest frequency in the PRG, or the REwith the lowest frequency except the RE where the CRS is, and the REwith the highest frequency in the PRG or the RE with the highestfrequency except the RE where the CRS is. The other REs of the DMRS aredistributed on the PRG as uniformly as possible. FIG. 7 is a sixth DMRSpattern on a frequency domain of the TTI according to an alternativeembodiment of the present disclosure. Being similar to the accompanyingdrawings from FIG. 2 to FIG. 4, the part of diagonals and the part ofsquares represent the DMRS. FIG. 8 is a seventh DMRS pattern on afrequency domain of the TTI according to an alternative embodiment ofthe present disclosure. Being similar to the accompanying drawings fromFIG. 2 to FIG. 4, the part of diagonals and the part of squaresrepresent the DMRS.

The above is the design of transmission patterns of the DMRS on thefrequency domain. The design of transmission patterns of the DMRS on atime domain is given below. In the accompanying drawings from FIG. 9 toFIG. 11, it is a PRB in the conventional art; a conventional CP isadopted; the horizontal axis represents the symbol, and there are 14OFDM symbols; the vertical axis represents a subcarrier, and there are12 subcarriers; each square represents an RE, and the square with Rrepresents the RE of the CRS.

In an exemplary embodiment, the reference signal is only allowed to betransmitted in the specified TTI. Preferably, for the TTI whose lengthis two symbols, and for the conventional CP, for example, the referencesignal is transmitted on the TTI #1 and the TTI #6 in FIG. 9. FIG. 9 isa first DMRS pattern on a time domain of the TTI according to analternative embodiment of the present disclosure. As shown in FIG. 9,two symbols on each TTI are occupied. The pattern on the frequencydomain may be according to the above mode. The pattern on the frequencydomain may also be other mode, being not limited to the modes presentedin the present embodiment. If the eNB configures for the UE that theDMRS is adopted for demodulation, when the UE is scheduled on the TTIs#1-5 of a sub-frame, the UE receives the DMRS in the TTI #1 of thissub-frame. When the UE is scheduled on the TTI #6 or the TTI #1 of thenext sub-frame, the UE receives the DMRS in the TTI #6 of thissub-frame. For the DCI, the situation is similar.

For an extended CP, for example, the reference signal is transmitted onthe TTI #2 and the TTI #5 in FIG. 10. FIG. 10 is a second DMRS patternon a time domain of the TTI according to an alternative embodiment ofthe present disclosure;

In an exemplary embodiment, the specified TTI is the odd-numberedsub-frames or the even-numbered sub-frames. Or, the specified TTIsatisfies n_(TTI) mod a=b, where n_(TTI) is the TTI index, the a is apositive integer greater than 1, and the b is a nonnegative integer. TheTTI index may be the index in a sub-frame, for example, 0-6 in FIG. 9,or the index in a radio frame, for example, 0-69, or the index in apreset number of sub-frames, for example, two sub-frames. In practicalapplications, the index is not limited to the above examples.

In an exemplary embodiment, the specified TTI may be the TTI in theMBSFN sub-frame.

In an exemplary embodiment, in the specified TTIs should not includethese TTIs only composed of PDCCH symbols, for example, the PDCCH istransmitted on the first two symbols of a sub-frame, if the first twosymbols of a sub-frame form a TTI, then the DMRS is not transmitted onthe TTI.

In an exemplary embodiment, the DMRS is only allowed to be transmittedon the symbols without the CRS in the specified TTI. Here, the CRS isthe one when the number of ports is 4; for example, for the conventionalCP, the symbols without the CRS are the third symbol, the fourth symbol,the sixth symbol and the seventh symbol of each time slot. Or, the CRShere may also be the one transmitted in the actual system; for example,for the conventional CP, if the number of ports in the actual system is2, then the symbols without the CRS are the second symbol, the thirdsymbol, the fourth symbol, the sixth symbol and the seventh symbol ofeach time slot. For example, the reference signal is transmitted on theTTI #0 and the TTI #4 in FIG. 9. When the reference signal istransmitted on the TTI #0, it is transmitted on two symbols; when thereference signal is transmitted on the TTI #4, it is only transmitted onthe second symbol, namely the symbol #9. On the symbol #9, the patternon the frequency domain may be according to the above mode. The patternon the frequency domain may also be other mode, being not limited to themodes presented in the present embodiment. On the TTI #4, the referencesignal is only transmitted on the symbol #9, for the pattern on thefrequency domain in FIG. 8, OCC, between two symbols, of the DMRS maynot be realized, that is, the CDM of two layers of DMRS may not beimplemented, so only two layers of DMRS of Frequency DivisionMultiplexing (FDM) may be supported. For example, FIG. 11 is a thirdDMRS pattern on a time domain of the TTI according to an alternativeembodiment of the present disclosure. In FIG. 11, a sub-frame is dividedinto four TTIs. the DMRS is transmitted on the TTIs #1 and #3 in FIG.11, and is transmitted on the last two symbols of each CRS on the TTIs#1 and #3.

In an exemplary embodiment, when the length of the TTI is 2, for theconventional CP, the TTI of transmitting the DMRS is one of following:the TTIs #1 and #3, the TTIs #1 and #4, the TTIs #1 and #5, the TTIs #1and #6, the TTIs #2 and #4, the TTIs #2 and #5, the TTIs #2 and #6, theTTIs #3 and #5, the TTIs #3 and #6, the TTIs #4 and #6, the TTIs #1, #3and #5, the TTI #1, 4 and 6, and the TTI #2, 4 and 6; herein, in asub-frame, every two symbols form one TTI, and the TTI indexes in asub-frame are respectively 0, 1, 2, 3, 4, 5 and 6 according to a timesequence.

In an exemplary embodiment, when the length of the TTI is 2, for annon-MBSFN sub-frame of an extended CP, or an MBSFN sub-frame, the TTI oftransmitting the DMRS is one of the following: the TTIs #1 and #3, theTTIs #1 and #4, the TTIs #1 and #5, the TTIs #2 and #4, the TTIs #2 and#5, the TTIs #3 and #5, and the TTIs #1, #3 and #5; herein, in asub-frame, every two symbols form one TTI, and the TTI indexes in asub-frame are respectively 0, 1, 2, 3, 4 and 5 according to a timesequence.

In an exemplary embodiment, when the length of the TTI is 4 or 3, forthe conventional CP, the TTI of transmitting the DMRS is one of thefollowing: the TTIs #1 and #3, the TTIs #0 and #2, and the TTIs #2 and#3; herein, in each time slot of a sub-frame, the first four symbols areone TTI, and the last three symbols are one TTI; or the first threesymbols are one TTI, and the last four symbols are one TTI; the TTIindexes in a sub-frame are respectively 0, 1, 2 and 3 according to atime sequence.

In an exemplary embodiment, when the length of the TTI is 3, for thenon-MBSFN sub-frame of the extended CP, or the MBSFN sub-frame, the TTIof transmitting the DMRS is one of the following: the TTIs #1 and #3,the TTIs #0 and #2, and the TTIs #2 and #3; herein, in a sub-frame,every three symbols form one TTI, and the TTI indexes in a sub-frame arerespectively 0, 1, 2 and 3 according to a time sequence.

In an exemplary embodiment, when the length of the TTI is 4, for thenon-MBSFN sub-frame of the extended CP, or the MBSFN sub-frame, the TTIof transmitting the DMRS is one of the following: the TTIs #1 and #2,the TTI #1, and the TTI #2; herein, in a sub-frame, every four symbolsform one TTI, and the TTI indexes in a sub-frame are respectively 0, 1,and 2 according to a time sequence.

In an exemplary embodiment, the DMRS corresponding to the information onthe current TTI of transmitting information is transmitted on the TTI oftransmitting the DMRS which is before the TTI (it is to be noted thatthe TTI is included) and closest to the TTI, that is, the UE may use theDMRS on the closest TTI of transmitting the DMRS before the TTI fortransmission to perform demodulation. For example, when the length ofthe TTI is 2, for the conventional CP, the TTIs of transmitting the DMRSare the TTIs #1 and #4. In a sub-frame, every two symbols form a TTI,and the TTI indexes in a sub-frame are respectively 0, 1, 2, 3, 4, 5 and6 according to a time sequence. Then, when the PDSCH of the UE is on theTTI #3, the DMRS on the TTI #1 is used to perform demodulation. In anexemplary embodiment, when the eNB schedules the UE to performtransmission in a plurality of continuous TTIs, it may indicate to theUE whether the DMRS has been transmitted. For example, when a piece ofDCI schedules a plurality of continuous TTIs, the TTI of transmittingthe DMRS may be indicated in the DCI; or, each TTI in the continuousTTIs may correspond to a piece of DCI, and each piece of DCI indicateswhether the DMRS is transmitted in the TTI.

In an alternative embodiment of the present disclosure, a design methodof the reference signal is provided. The present embodiment iselaborated by taking the DMRS for example, and the presented method isnot limited to being applied to the DMRS.

In a system supporting a short TTI, a sub-frame is divided into aplurality of TTIs, and each TTI occupies several symbols. For example,the short TTI is two symbols, and a sub-frame of the conventional CP maybe divided into seven short TTIs. In practical applications, such alength of the short TTI does not form a limit, and the length may alsobe variable in a sub-frame.

All the DMRSs on the TTIs may be designed based on that there is theCRS, that is, the RE where the DMRS is should not occupy the RE wherethe CRS is. Here, the RE where the CRS is may be the RE occupied by theactual CRS in the system; for example, if the eNB has only two ports,namely the port #0 and the port #1, the DMRS is on the RE except theport #0 and the port #1. Or, the RE where the CRS is may also bedetermined according to a preset mode; for example, no matter what theactual CRS port is, the RE where the CRS is corresponds to the CRS offour ports. Or, when the CRS is a port (for example, the port #0), itmay be assumed that the CRS is on the RE of two ports (for example, theport #0 and the port #1).

In an exemplary embodiment, the frequency-domain position of the DMRS isdetermined by at least one of the TTI index and the types of the TTI.For example, for a scenario of the conventional CP when the length ofthe TTI is 2, the frequency-domain positions of the DMRSs on the TTIs #1and #6 are the same, but have a fixed offset with the frequency-domainpositions of the DMRSs on the other TTIs. The types of the TTI includethe TTI including the CRS and the TTI not including the CRS. There is afrequency offset between the frequency-domain positions of the DMRSs onthe TTI including the CRS and the TTI not including the CRS.

In an exemplary embodiment, on the TTI including the CRS, if the REcorresponding to the DMRS is occupied by the CRS, the CRS eliminates thesymbol on the DMRS, that is, when the RE corresponding to the DMRS is assame as the RE corresponding to the CRS, the CRS occupies the REpreferentially, as shown in FIG. 2. Or, for the TTI not including theCRS, the RE occupied by the DMRS ignores the position of the CRS, thatis, the DMRS may occupy the RE corresponding to the subcarrier where theCRS is. For the TTI including the DMRS, the DMRS does not occupy the REof the CRS, herein the RE of the CRS is as same as the abovedescription.

Through the above description of the implementations, those skilled inthe art may clearly know that the method according to the aboveembodiments may be implemented by means of software plus a necessarycommon hardware platform, certainly by means of hardware; but in manycases, the former is the better implementation. Based on thisunderstanding, the technical solutions of the present disclosuresubstantially or the part making a contribution to the prior art may beembodied in the form of software product; the computer software productis stored in a storage medium (e.g. a Read Only Memory (ROM)/RandomAccess Memory (RAM), a magnetic disk, and a compact disc) and includes anumber of instructions to make a terminal device (which may be a mobilephone, a computer, a server or a network device, etc.) perform themethod in each embodiment of the present disclosure.

Second Embodiment

The present embodiment provides a device for transmitting information,which is configured to implement the above embodiments and preferredimplementations. The embodiments which have been elaborated will not berepeated here. The term “module” used below can realize a combination ofsoftware and/or hardware with an intended function. Although the devicedescribed in the following embodiment is realized through softwarebetter, the realization through hardware or a combination of softwareand hardware is possible and conceived.

FIG. 12 is a structure diagram of a device for transmitting informationaccording to an alternative embodiment of the present disclosure. Asshown in FIG. 12, the device includes a determining module 122 and atransmitting module 124.

The determining module 122 is configured to determine, according to thepredetermined mode and/or eNB configuration mode, at least one of thefollowing: the PRG, the reference signal, and the frequency-domainresource allocation granularity.

The transmitting module 124 is connected to the determining module 122,and is configured to transmit information in the TTI.

In an exemplary embodiment, the numbers of RRBs corresponding to the PRGbelong to a set, and each element in the set is equal to the integralmultiple of the minimum value in the set. The set is obtained accordingto the predetermined mode or the eNB configuration mode, and the set isthe same for all system bandwidths.

In an exemplary embodiment, modes of indicating the PRG according to eNBinclude one of the following: configuring through the SIB, configuringthrough the RRC signaling, and configuring through the DCI.

In an exemplary embodiment, the set is determined according to thelength of the TTI. In an exemplary embodiment, the number of the PRBscorresponding to the PRG or the minimum value in the set is one of thefollowing: one of the factors, except 1, of 12, and an integral multipleof one of the factors, except 1, of 12.

In an exemplary embodiment, the number of the PRBs corresponding to thefrequency-domain resource allocation granularity is one of thefollowing: an integral multiple of the number of the PRBs correspondingto the PRG, an integral multiple of a common multiple of the number ofthe PRBs corresponding to the PRG and the number of the PRBscorresponding to the RBG in the system, an integral multiple of theminimum value in the set, and an integral multiple of the commonmultiple of the minimum value in the set and the number of the PRBscorresponding to the RBG in the system.

In an exemplary embodiment, the PRG is determined according to one ofthe following modes: in the span of frequency-domain resource allocatedto the UE, starting from the initial PRB, every m PRBs are one PRG; andin the frequency-domain resources allocated to the UE, starting from theinitial PRB, every m PRBs are one PRG; herein the m is preset orconfigured by the eNB.

In an exemplary embodiment, on an OFDM symbol where the reference signalis, in the m continuous PRBs, for each layer of reference signal, one ofevery x REs is the reference signal, herein the x is one of thefollowing:

an integral multiple of 3;

${{x = \left\lfloor \frac{{12m} - 2}{n - 1} \right\rfloor};{x = \left\lfloor \frac{{12m} - 1}{n - 1} \right\rfloor}},$where the function └ ┘ means rounding down, the m is a positive integergreater than 1, and the n and the x are positive integers.

In an exemplary embodiment, the n is the number of the REs correspondingto each layer of DMRS in the m continuous PRBs on the OFDM symbol.

In an exemplary embodiment, on the OFDM symbol where the referencesignal is, and in the m continuous PRBs, the reference signal occupiesat least one of the following: the RE with the lowest frequency in thePRG, or the RE with the lowest frequency, except the RE where the CRSis, in the PRG; the RE with the highest frequency in the PRG, or the REwith the highest frequency, except the RE where the CRS is, in the PRG.

In an exemplary embodiment, the value of the m is one of the following:the number of the PRBs corresponding to the PRG in the system, theminimum value in the set, the number of the PRBs corresponding to theRBG in the system, the preset value, the value configured by the eNB,and the number N of the PRBs corresponding to the frequency-domain spanof transmitting the information; └N/k┘, where the k is a preset positiveinteger or a positive integer configured by the eNB.

In an exemplary embodiment, the m continuous PRBs are one of thefollowing: the PRG in the system, the PRG corresponding to the minimumvalue in the set, the RBG in the system, and the m continuous PRBs inthe frequency-domain span of transmitting the information.

In an exemplary embodiment, the reference signal is transmitted in thespecified TTI.

In an exemplary embodiment, the specified TTI satisfies at least one ofthe following conditions: the specified TTI does not include the CRS;the specified TTI satisfies n_(TTI) mod a=b, wherein n_(TTI) is a TTIindex, the a is a positive integer greater than 1, the b is anonnegative integer, and they are preset or notified by eNB. Thespecified TTI is the TTI of an odd number index or the TTI of an evennumber index. The specified TTI is the TTI in a Multicast/BroadcastSingle Frequency Network (MBSFN). There is at least one symbol in thespecified TTI not transmitting the PDCCH.

In an exemplary embodiment, the reference signal is transmitted on thesymbol, which does not include the CRS, in the specified TTI.

In an exemplary embodiment, when the length of the TTI is 2, for theconventional CP, the TTI of transmitting the CRS is one of thefollowing: the TTIs #1 and #3, the TTIs #1 and #4, the TTIs #1 and #5,the TTIs #1 and #6, the TTIs #2 and #4, the TTIs #2 and #5, the TTIs #2and #6, the TTIs #3 and #5, the TTIs #3 and #6, the TTIs #4 and #6, andthe TTIs #1, #3 and #5; wherein, in a sub-frame, every two symbols formone TTI, and the TTI indexes in a sub-frame are respectively 0, 1, 2, 3,4, 5 and 6 according to a time sequence.

In an exemplary embodiment, when the length of the TTI is 2, for anon-MBSFN sub-frame of an extended CP, or an MBSFN sub-frame, the TTI oftransmitting the CRS is one of the following: the TTIs #1 and #3, theTTIs #1 and #4, the TTIs #1 and #5, the TTIs #2 and #4, the TTIs #2 and#5, the TTIs #3 and #5, and the TTIs #1, #3 and #5; herein, in asub-frame, every two symbols form one TTI, and the TTI indexes in asub-frame are respectively 0, 1, 2, 3, 4 and 5 according to a timesequence.

In an exemplary embodiment, when the length of the TTI is 4 or 3, forthe conventional CP, the TTI of transmitting the CRS is one of thefollowing: the TTIs #1 and #3, the TTIs #0 and #2, and the TTIs #2 and#3; herein, in each time slot of a sub-frame, the first four symbols areone TTI, and the last three symbols are one TTI; or the first threesymbols are one TTI, and the last four symbols are one TTI; the TTIindexes in a sub-frame are respectively 0, 1, 2 and 3 according to atime sequence.

In an exemplary embodiment, when the length of the TTI is 3, for thenon-MBSFN sub-frame of the extended CP, or the MBSFN sub-frame, the TTIof transmitting the CRS is one of the following: the TTIs #1 and #3, theTTIs #0 and #2, and the TTIs #2 and #3; herein, in a sub-frame, everythree symbols form one TTI, and the TTI indexes in a sub-frame arerespectively 0, 1, 2 and 3 according to a time sequence.

In an exemplary embodiment, when the length of the TTI is 4, for thenon-MBSFN sub-frame of the extended CP, or the MBSFN sub-frame, the TTIof transmitting the CRS is one of the following: the TTIs #1 and #2, theTTI #1, and the TTI #2; herein, in a sub-frame, every four symbols formone TTI, and the TTI indexes in a sub-frame are respectively 0, 1, and 2according to a time sequence.

In an exemplary embodiment, the frequency-domain position of thereference signal is determined by at least one of a cell identity, theTTI index, or types of the TTI; herein the types of the TTI include theTTI including the CRS and the TTI not including the CRS.

In an exemplary embodiment, when the RE corresponding to the DMRS is assame as the RE corresponding to the CRS, the CRS occupies the REpreferentially.

It is to be noted that each of the above modules may be realized bysoftware or hardware. For the latter, the each of the above modules maybe realized by, but not limited to, the following way: all of the abovemodules are in the same processor; or, the above modules arerespectively in different processors in form of any combination.

Third Embodiment

The embodiments of the present disclosure also provide a storage medium.In an exemplary embodiment, in the present embodiment, the storagemedium may be set to store program codes for performing the followingsteps.

At S1, according to the predetermined mode and/or eNB configurationmode, at least one of the PRG, the reference signal, or thefrequency-domain resource allocation granularity is determined.

At S2, information is transmitted in the TTI.

In an exemplary embodiment, in the present embodiment, the storage mediainclude, but not limited to, a USB flash disk, an ROM, an RAM, a mobilehard disk, a magnetic disk, a compact disc, and other media capable ofstoring the program codes.

In the present embodiment, the processor performs, according to theprogram codes stored in the storage medium, the steps of the methodrecorded in the above embodiments.

In an exemplary embodiment, the specific examples in the presentembodiment may refer to the examples described in the above embodimentsand alternative embodiments.

It is apparent that those skilled in the art should appreciate that theabove modules and steps of the present disclosure may be implemented bya general-purpose computing device, and they may be centralized in asingle computing device or distributed on a network composed of multiplecomputing devices; optionally, they may be implemented by a program codewhich is capable of being executed by the computing device, so that theymay be stored in a storage device and executed by the computing device;and in some situations, the presented or described steps may be executedin an order different from that described here; or they are made intointegrated circuit modules, respectively; or multiple modules and stepsof them are made into a single integrated circuit module to realize.Therefore the present disclosure is not limited to any particularcombination of hardware and software.

The above is only the preferred embodiments of the present disclosureand not intended to limit the present disclosure; for those skilled inthe art, the present disclosure may have various modifications andchanges. Any modifications, equivalent replacements, improvements andthe like within the principle of the present disclosure should fallwithin the protection scope of the claims of the present disclosure.

What is claimed is:
 1. A method for transmitting information,comprising: determining, according to a predetermined mode and/or eNBconfiguration mode, a reference signal; and transmitting information ina Transmission Time Interval (TTI); wherein on one of OrthogonalFrequency Division Multiplexing (OFDM) symbols where the referencesignal is, and in m continuous PRBs, for each layer of reference signal,one in every x continuous Resource Elements (RE) is the referencesignal, wherein the x is one of the following: an integral multiple of3;${{x = \left\lfloor \frac{{12m} - 2}{n - 1} \right\rfloor};{x = \left\lfloor \frac{{12m} - 1}{n - 1} \right\rfloor}},$where └ ┘ is a function of rounding down, m is a positive integergreater than 1, and n and x are positive integers, n is the number ofthe REs corresponding to each layer of Demodulation Reference Signal(DMRS) in the m continuous PRBs on the OFDM symbol.
 2. The method asclaimed in claim 1, wherein numbers of Physical Resource Blocks (RRB)corresponding to the PRG belong to a set; each element in the set isequal to an integral multiple of the minimum value in the set; whereinthe set is obtained according to the predetermined mode or the eNBconfiguration mode, and the set is the same for all system bandwidths.3. The method as claimed in claim 2, wherein the set is determinedaccording to a length of the TTI.
 4. The method as claimed in claim 1,wherein the eNB configuration modes comprise one of the following:configuring through a System Information Block (SIB), configuringthrough a Radio Resource Control (RRC) signaling, and configuringthrough a Downlink Control Information (DCI).
 5. The method as claimedin claim 1, the number of the PRBs corresponding to the PRG or theminimum value in the set is one of the following: one of factors, except1, of 12, and an integral multiple of one of the factors, except 1, of12.
 6. The method as claimed in claim 1, wherein the number of the PRBscorresponding to the frequency-domain resource allocation granularity isone of the following: an integral multiple of the number of the PRBscorresponding to the PRG; an integral multiple of a common multiple ofthe number of the PRBs corresponding to the PRG and the number of thePRBs corresponding to a Resource Block Group (RBG) in a system; anintegral multiple of the minimum value in the set, and an integralmultiple of the common multiple of the minimum value in the set and thenumber of the PRBs corresponding to the RBG in the system.
 7. The methodas claimed in claim 1, wherein the PRG is determined according to one ofthe following modes: in a span of frequency-domain resource allocated toa piece of User Equipment (UE), starting from an initial PRB, every mPRBs are one PRG; and in the frequency-domain resources allocated to theUE, starting from the initial PRB, every m PRBs are one PRG; wherein them is a preset positive integer greater than 1, or is configured by theeNB.
 8. The method as claimed in claim 1, wherein the value of the m isone of the following: the number of the PRBs corresponding to the PRG inthe system, the minimum value in the set, the number of the PRBscorresponding to the RBG in the system, a preset value, a valueconfigured by the eNB, and the number N of the PRBs corresponding to afrequency-domain span of transmitting the information; └N/k┘, where k isa preset positive integer or a positive integer configured by the eNB.9. The method as claimed in claim 1, wherein the m continuous PRBs areone of the following: the PRG in the system, the PRG corresponding tothe minimum value in the set, the RBG in the system, and the mcontinuous PRBs in the frequency-domain span of transmitting theinformation.
 10. The method as claimed in claim 1, wherein on the OFDMsymbol where the reference signal is, and in the m continuous PRBs, thereference signal occupies at least one of the following: the RE with thelowest frequency in the m continuous PRBs, or the RE with the lowestfrequency, except the RE where a Cell Reference Signal (CRS) is, in them continuous PRBs; the RE with the highest frequency in the m continuousPRBs, or the RE with the highest frequency, except the RE where the CRSis, in the m continuous PRBs; wherein the m is a positive integergreater than
 1. 11. The method as claimed in claim 1, wherein thereference signal is transmitted in a specified TTI.
 12. The method asclaimed in claim 11, wherein the specified TTI satisfies at least one ofthe following conditions: the specified TTI does not include the CRS;the specified TTI satisfies n_(TTI) mod a=b, where n_(TTI) is a TTIindex, the a is a positive integer greater than 1, the b is anonnegative integer, and they are preset or notified by eNB; thespecified TTI is the TTI of an odd number index or the TTI of an evennumber index; the specified TTI is the TTI in a Multicast/BroadcastSingle Frequency Network (MBSFN); and there is at least one symbol inthe specified TTI not transmitting a Physical Downlink Control Channel(PDCCH).
 13. The method as claimed in claim 12, wherein the CRS is theone when the number of ports is 4, or the one which is transmitted in anactual system.
 14. The method as claimed in claim 11, wherein thereference signal is transmitted on the symbol, which does not includethe CRS, in the specified TTI.
 15. The method as claimed in claim 11,wherein when the length of the TTI is 2, for a conventional CP, the TTIof transmitting the CRS is one of the following: the TTIs #1 and #3, theTTIs #1 and #4, the TTIs #1 and #5, the TTIs #1 and #6, the TTIs #2 and#4, the TTIs #2 and #5, the TTIs #2 and #6, the TTIs #3 and #5, the TTIs#3 and #6, the TTIs #4 and #6, and the TTIs #1, #3 and #5; wherein, in asub-frame, every two symbols form one TTI, and the TTI indexes in asub-frame are respectively 0, 1, 2, 3, 4, 5 and 6 according to a timesequence; or when the length of the TTI is 2, for the conventional CP,the TTI of transmitting the reference signal is one of the following:the TTIs #1 and #3, the TTIs #1 and #4, the TTIs #1 and #5, the TTIs #1and #6, the TTIs #2 and #4, the TTIs #2 and #5, the TTIs #2 and #6, theTTIs #3 and #5, the TTIs #3 and #6, the TTIs #4 and #6, the TTIs #1, #3and #5, the TTI #1, 4 and 6, and the TTI #2, 4 and 6; wherein, in asub-frame, every two symbols form one TTI, and the TTI indexes in asub-frame are respectively 0, 1, 2, 3, 4, 5 and 6 according to a timesequence; or when the length of the TTI is 2, for a non-MBSFN sub-frameof an extended CP, or an MBSFN sub-frame, the TTI of transmitting thereference signal is one of the following: the TTIs #1 and #3, the TTIs#1 and #4, the TTIs #1 and #5, the TTIs #2 and #4, the TTIs #2 and #5,the TTIs #3 and #5, and the TTIs #1, #3 and #5; wherein, in a sub-frame,every two symbols form one TTI, and the TTI indexes in a sub-frame arerespectively 0, 1, 2, 3, 4 and 5 according to a time sequence; or whenthe length of the TTI is 4 or 3, for the conventional CP, the TTI oftransmitting the reference signal is one of the following: the TTIs #1and #3, the TTIs #0 and #2, and the TTIs #2 and #3; wherein, in eachtime slot of a sub-frame, the first four symbols are one TTI, and thelast three symbols are one TTI; or the first three symbols are one TTI,and the last four symbols are one TTI; the TTI indexes in a sub-frameare respectively 0, 1, 2 and 3 according to a time sequence; or when thelength of the TTI is 3, for a non-MBSFN sub-frame of an extended CP, oran MBSFN sub-frame, the TTI of transmitting the reference signal is oneof the following: the TTIs #1 and #3, the TTIs #0 and #2, and the TTIs#2 and #3; wherein, in a sub-frame, every three symbols form one TTI,and the TTI indexes in a sub-frame are respectively 0, 1, 2 and 3according to a time sequence; or when the length of the TTI is 4, for anon-MBSFN sub-frame of an extended CP, or an MBSFN sub-frame, the TTI oftransmitting the reference signal is one of the following: the TTIs #1and #2, the TTI #1, and the TTI #2; wherein, in a sub-frame, every foursymbols form one TTI, and the TTI indexes in a sub-frame arerespectively 0, 1, and 2 according to a time sequence.
 16. The method asclaimed in claim 11, wherein the reference signal corresponding to theinformation is transmitted in the specified TTI which is before andclosest to the TTI.
 17. The method as claimed in claim 1, wherein afrequency-domain position of the reference signal is determined by atleast one of the following: a cell identity, the TTI index, or types ofthe TTI; wherein the types of the TTI comprise the TTI including the CRSand the TTI not including the CRS.
 18. The method as claimed in claim 1,further comprising: when the RE corresponding to the reference signal isas same as the RE corresponding to the CRS, the CRS occupies the REpreferentially.
 19. A device for transmitting information, comprising: adetermining module, which is configured to determine, according to apredetermined mode and/or eNB configuration mode, a reference signal;and a transmitting module, which is configured to transmit informationin a Transmission Time Interval (TTI); wherein on one of OrthogonalFrequency Division Multiplexing (OFDM) symbols where the referencesignal is, and in m continuous PRBs, for each layer of reference signal,one in every x continuous Resource Elements (RE) is the referencesignal, wherein the x is one of the following: an integral multiple of3;${{x = \left\lfloor \frac{{12m} - 2}{n - 1} \right\rfloor};{x = \left\lfloor \frac{{12m} - 1}{n - 1} \right\rfloor}},$where └ ┘ is a function of rounding down, m is a positive integergreater than 1, and n and x are positive integers, n is the number ofthe REs corresponding to each layer of Demodulation Reference Signal(DMRS) in the m continuous PRBs on the OFDM symbol.